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Optical element and optical pickup apparatus

Title: Optical element and optical pickup apparatus.
Abstract: A production method of an objective lens for optical pickup apparatus having a numerical aperture NA of image side of 0.80 to 0.90 is disclosed. The method includes steps of molding resin composition containing copolymer of α-olefin and a cyclic olefin represented by Formula (I) or (II) to form lens shape, and thermally processing the molded product under a condition at a temperature between Tg −45° C. and Tg −15° C. for 12 to 168 hours, wherein the Formula (I) and (II) is detailed in the specification. ...
USPTO Applicaton #: #20090312510
Inventors: Yayoi Eguro

The Patent Description & Claims data below is from USPTO Patent Application 20090312510, Optical element and optical pickup apparatus.

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Industry Class:
Synthetic resins or natural rubbers -- part of the class 520 series
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stats Patent Info
Application #
US 20090312510 A1
Publish Date
Document #
File Date
Other USPTO Classes
264/26, 359355
International Class

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Numerical Aperture
Objective Lens

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